Drilling mechanism



' July 3l, 1928-.

J. G. GRAHAM DRILLING MECHANISM Q @L A@ gv@ a s S QS ENQ SQ Filed May '7, 1924 Patented July 31, 1928.

UNITED STATES 1,679,140 PATENT oFFiCE.

JAMES G. GRAHAM, F BUTTE, MONTANA, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION 0F MASSACHUSETTS.,

DRILLING `MECHANISM.

Appiicationiiied may 7, 19.24. serial No.` 711,530.

My invention relates to drilling mechanisms. g An object of my invention. an improved drilling mechanism. Another object of my invention is to provide an imroved drilling mechanism having improved ubric'ating means therefor whereby oil, as distinguished fronigreasegiiaybe used. .A Jfurther object of my invention is to provide an improved automatic lubricating means controlled by the vibration oi the drill. A still further object of my invention is'to provide an improved lubricating mechanismfor the chuck or piston flutes of a. drill. Still another object lof my invention is to provide such an improved lubricating mechanism which is responsive to vibrations set upin the drilling motor. y

In the accompanying drawings I have shown for purposes of illustration three forms which my invention may assume in practice.

Fig. 1 is aside elevation, partially in central longitudinal section, `of the drilling mechanism in which my improved lubricatf .ing mechanism is incorporated.

f Fig. 2 is an enlarged detailed sectional view of my improved lubricating mechanism.

Fig. 3 is a detailed sectional view, similar to Fig. 2, of the modifiedform of vconstruction.

Fig. 4 is a side elevation partially in section of the drilling mechanism incorporating my improved lubricating mechanism, showing a modified formV of arrangement.

In the illustrative form of myk invention shown in Figs. 1 and 2, Ihave shown the same embodied in a drilling mechanism, generally designated 1, of the d rifter type. This mechanism comprises a cylinder 2having a bore 3 in which a hammer piston 1s reciprocable having a striking bar 4 adapted to impart a series of blows to the shank of the drill steel 5 carried in a chuck bushing 6. As shown, this bushing 6 is suitably arranged within an elongated chuck 7 carried in a longitudinally extending bore 8 which is in turn formed within a chuck housing 9 secured as by side rods 10 to the cylinder 2. It will be observed that the striking bar 4 is provided with flutes or grooves 11 cooperating with inwardly projecting lugs 12 formed on a chuck nut 13 suitably threaded as at14 within the rear end of the chuck. g- The hammer .is to provide piston, which carries the rile bar 4, also cooperates with an automatic stepby step ro.- tation mechanism, not shown, ofthe usual ratchet and pawl typewhich is adapted to impart intermittent yrotary movement tothe striking bar andV consequently to the chuck. 7 and chuck bushing 6, which carries the drill steel 5. The chuck housing 9 is alsov provided with a radially extending port 15 which is closed by a removable filler plug 16 and this port communicates with an annular groove 17 formed by an enlarged portion of the rear end of. the bore 8. The Iforward end of the cylinder 2 is provided with a forwardly projecting portion 18 having an Vaiinulail portion 19 which fits into the rear end ot-Afthe bore 8 and with which therear end of the chuck 7 engages.` This portion 18 is herein provided with anannular groove 2O which cooperates with the groove 17 in the chuck housing, forming a chamber 21 adapted .to receive lubricant, herein oil. It will also be noted that the annular portion 19'is provided with a plurality of longitudi nally extending bores 22 into which my improved lubricatingv mechanism, generally designated 23, is disposed. i

' This improved mechanism comprises a plug 24 pressed'within one ofthe bores 22 against a shoulder 25 and is provided with an axially disposed bore 26 into which va pin member 27 is inserted of slightly smaller diameter than the bore 26 and which is provided with a head 28 and an angular or hentover portion 29 on the opposite end from the head 28, thereby preventing,displacement of the pin member 27. 'p The head 28 forms a valve member which cooperates with the end of the bore 26 to control the flow of lubricant from the chamber. 21 to an annular groove 30 formed in the annular portion 19 which in turncommunicates with the flutes or grooves 11 formed in the striking bar 4 and with the bore 8in which the chuck 7 rotates, lubricating the same. y

In the form of my invention` shown in Fig. 3, it willbe noted that I have provided a 'plug member 31 inserted in the bore 22 and this plug member is providedrwith an annular bore 32 which communicates with the groove-30 by means of the plurality of ports 33 formed inthe forward e'nd thereof. The rear end of the bore`22 communicates with the chamber 21 by way of the port 34 which isnormally closed by a conical end seated valve heldin position by means of the light coil spring 36 disposed within'thechamber 32.

In the form of my invention shown ,inrFigi 4, I have shown my improved lubricating mechanism embodied in a drilling mechanism, generally designated 37, of the stoper which comprises a drilling motor cylinder E38-having a bore 39 in which a hammer piston is reciprocable having a" forwardly projecting striking bar 40 adapted to impart a series ojl' blows through a striking block 4I to a" drill steel 42. The drill steel 42 is carried in a chuck 43 suitably threaded within the vforward end oit the chuck sleeve 44 which is arranged in a bore 45 formed with in a chuck housing 4G suitably secured to the cylinder 38 as by side rods 4T in a well known manner. The striking bar 40 of the piston is provided with flutes or grooves 48 which cooperate with inwardly projecting lugs 49ftormed on a chuck nut 5() suitably threaded as at 5l within the rear end of the chuckv sleeve 44. Arranged longitudinally of the chuck housing 4G is a bore 52 which 'forms a lubricant chamber having its tor-4 ward end; closed by aV removable liller plug 53 and which communicates at its rear end through my improved lubricating mechanisin, generally designated'QB, with radially extending groovesi54 formed in the chuck sleeve and nut leading to the grooves 48 formed in the striking bar aiidiwith the annular bore 45 in which the `chuck rotates.

The mode oi operation of myimpi'oved lubricating mechanism is as follows. During the drilling operation the hammer piston imparts a series oit blows tothe drill steel 5 and rotates the latter, causing the piston to set up aseries o't vibrations within the drilling mechanism. Thesefvibrations are imparted to the lubricator 23- causing `th`e valvei'orming head .28,by means of inertia, to intermittently open and close com munication between the bore leading to the chamber 21 and the groove, 30 which int-urn communicates with the grooves llV in a strik1 ing bar 4 and with the bore 8 in whicli'the chuck 7 is rotated,'lubricating the same. rlhe operation o't the torni of my invention shown in Fig?) is substantially similar to that in Figs. l and 2. rIhe valve 35i interfinittently opens andV closes communica-tion, by means oi' inertia caused by the vibration set up within the drilling motor, between the chamber 21 and the bore 32'orined in the member 3l,

In the form of my invention shown in Fig. 4, it' will be noted th at the vibrations set up by. the hammer piston actuating the drill steel cause the automatic inertia; operated valve mechanism 23 to permit intermittent communication between the oil chamber 52 and the groove 54 and the bore 45 in which the chuck sleeve 44 rotates, lubricating the tation mechanism which is of exceedingly' siinple and compact construction and which may be manufactured: ati a minimunrot eX- peiise andappliedto a drilloiC standardfcom struction with' a ininimuniot change.

IWhile Ihave'in vthis application specifically described three formswliiclr myinvenL` tion may assum'e'in practice, it will be understood'tliat` these forms otthesame are shown for purposes of illustration and that the invention may beinodilied'andembodied in various other forms withoutl'departing from its *spirit or the scope oli the appendedlclaimsV INhat I claim as new and desire to secure by Letters Patent is 11 In a rock drill, the combination with an impact motor having a cylinder, and a piston reciprocable therein having a torwardly projecting extension, of lubricating n'ieanst'or said extension comprisingn a lubr cant reservoir formed in said cylinder atthe forward end thereof, a passage formed in saidt cylinderV and connecting said reservoir with said extension; vand means comprising a `valve ttor providing intermittent tlow of lubricant through said passage.

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2. In a rock drill, the combination with an impact motor'having acylinder, and a piston` reciprocable therein having a. tor wardly projectingextension, of lubricating means for said extension comprising a lubricant reservoir formed in said cylinder at the forward endi thereof, a passage formed in saidcylihder andffconnecting said reservoir with said` extension, and'` nieans comprising a valve operated by the vibrating action ot said motor for automatically controlling` the lbw of lubricant through said passage. y

3.In' a.rock drill', the combination with an impactmotor having a cy/*linden a hammer piston yreciprocable in said cylinder and having a forwardly projecting extension and a chuck housingpot lubricating'means for saidV extension comprising annular grooves formed in the'forward endtof said cylinder and in said housingcooperatingto :torni a lubricant reservoir, a passage 'leading :trom said` reservoir tosaidV extension, and means comprising a valve for Vcontrolling the flow o'f lubricant. through said passage.

4'.` In a rock drill, the combinationwith lan impact motor having a cylinder, a piston reciprooable in said cylinder and'having a forwardly projecting extension, a chuck housing and a rotatable chuck therein, of lubricating means for said extension and chuck comprising a lubricant reservoir formed in the forward end of the mot-or in said cylinder and housing, a passage connecting said reservoir with said extension and chuck, and means comprising a valve for controlling flow of lubricant through said passage.

5. In a rock drill, the combination with an impact motor having a cylinder, a piston reciprocable in said cylinder and having a forwardly projecting extension, a chuck housing and a. rotatable chucktherein, of lubricating means for said extension and chuck comprising a lubricant reservoir formed in the forward end of the motor in said cylinder andhousing, a passage connecting said reservoir with said extension and chuck, and means comprising a valve operated by the vibrating action of said motor for automatically controlling flow of lubricant through said passage.

6. In a rock drill, the combination with j an impact motor having a cylinder, a piston reciprocable in said cylinder and having a forwardly projecting extension, a chuck housing and a rotatable chuck therein, of lubricating means for said extension and chuck comprising annular grooves formed in the forward end of said cylinder and in said housing cooperating to form a lubricant reservoir, a passage connecting said reservoir with said extension and chuck, and means comprising a valve for controlling flow of lubricant through said passage.

7. In a rock drill, the combination with an impact motor having a cylinder, a piston reciprocable in said cylinder and having a forwardly projecting extension, a chuck housing, a chuck rotatable in said housing, said chuck having its rear end disposed adjacent the forward end of said cylinder, of lubricating means for said extension and chuck comprising annular grooves in the forward end of said cylinder and in said chuck housing cooperating to form a lubricant reservoir, a passage formed in the forward endy of said cylinder between the latter andsaid chuck for connecting said reservoir therewith, and means comprising a valve 0perated by the vibrating action of said motor for automatically controlling flow of lubricant through said passage.

8. In a rock drill, the combination with an impact motor including a cylinder having a reduced bore at the front end thereof, a rotatable chuck, a hammer piston reciprocable in said cylinder and having a forwardly projecting extension passing through said reduced bore, of lubricating means for said chuck and said bore comprising an annular groove formed in the forward portion of said cylinder surrounding said extension, said groove forming a lubricant reservoir, a passage connecting said reservoir with said reduced bore, and means comprising a valve operated by the vibrating action of said motor for automatically controlling the flow of lubricant through said passage.

9. In a rock drill, the combination with a cylinder, a reciprocable piston having a forwardly projecting extension, and a cylinder head forming portion through which said extension passes, of lubricating means for said extension comprising an external annular groove formed in said cylinder head portion adapted to receive lubricant and having communication with said extension, and means comprising a valve operated by the vibrating action of said motor for automatically controlling flow of lubricant through said extension.

l0. In a rock drill, the combination with an impact motor including a cylinder having a reduced bore and a reciprocable piston having a forwardly projecting extension passing through said bore, of lubricating means for said extension comprising a lubricant reservoir formed in the forward portion of said cylinder'surrounding said extension, a passage connecting said reservoir with said reduced bore, and means comprising a valve operated by the vibrating action of said motor for automatically controlling the ow of fluid through said passage.

11. In a rock drill, the combination with an impact motor including a cylinder and a rotatable chuck, of lubricating means for said chuck comprising a lubricant reservoir formed in the forward end of said cylinder adj acentpthe rear end of said chuck and having communication with the latter, and an inertia operated valved means for automatically controlling the flow of lubricant from said reservoir to said chuck.

In testimonyA whereof I aiix my signature'.

JAMES G. GRAHAM.

CERTIFICATE oF CORRECTION.

Patent No. 1,679,140. Granted July 31, 1928', to

JAMES C. GRAHAM.

It is hereby certified that error appears in the printed specification of the `above numbered patent requiring correction as follows: Page 2, line 8, before the word "which" insert the word "type"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent ffice.

Signed and sealed this 25th day of September, A. D. 1928.

M. vJ. Moore, (Seal) Acting Commissioner of Patents. 

